Jan 9 (Reuters) - Wall Street extended a rally into a fourth session on Wednesday, led by Apple, chipmakers and other trade-sensitive stocks after signs of progress in trade talks between the United States and China.

The benchmark S&P 500 is up about 10 percent from a 20-month low it touched around Christmas, boosted by hopes for a deal between the world’s two largest economies, which eased some worries over the impact of the trade spat on global growth. Market participants were also encouraged by strong U.S. jobs data and indications the Federal Reserve is in no rush to raise interest rates.

China pledged to purchase “a substantial amount” of agricultural, energy and manufactured goods and services from the United States, the U.S. Trade Representative’s office said, as talks wrapped up in Beijing.

The S&P technology index rose 1.54 percent, leading other sectors.

Apple Inc added 2.16 percent despite a Nikkei report that the company had reduced planned production for its three new iPhone models for the January-March quarter.

The company’s shares tumbled about 10 percent last week after it warned on holiday quarter sales and its suppliers, which largely include chipmakers, took another beating on Tuesday after Samsung Electronics flagged weak chip demand.

The Philadelphia Semiconductor index gained 2.66 percent. Chipmakers are among the U.S. multinationals with the highest revenue exposure to China.

“If you want to gauge how investors are viewing the trade talks, just walk tech, and semiconductors in particular,” said Jack Ablin, chief investment officer at Cresset Wealth Advisors in Chicago.

Shares of Boeing Co, which also has a large exposure to China, climbed 1.32 percent, with the S&P industrial index gaining 0.99 percent.

The CBOE Volatility index, often referred to as an investor fear gauge, dropped half-a-point to a one-month low of 20.04.

The Dow Jones Industrial Average was up 0.63 percent at 23,937.43 points, while the S&P 500 gained 0.61 percent to 2,590.11.

The Nasdaq Composite added 1.08 percent to 6,971.70.

Financial stocks rose 0.64 percent.

Several Fed policymakers said they could wait on any further interest rate hikes until they had a better handle on whether growing risks will undercut an otherwise solid U.S. economic outlook.

“A more stable Fed is going to lead to more stable markets over time,” said Mark Heppenstall, chief investment officer at Penn Mutual Asset Management in Horsham, Pennsylvania.

“Some of the sharp moves in the market were driven by the fact that Fed tightening is starting to have an impact on economic growth and financial conditions.”